Question

Which transformation will always map a parallelogram onto itself?

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11

a 90° rotation about its center

a reflection across one of its diagonals

a 180° rotation about its center

a reflection across a line joining the midpoints of opposite sides
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Answer 1

The transformation that will always map a parallelogram onto itself is a reflection across a line joining the midpoints of opposite sides. A 90° rotation about its center, a reflection across one of its diagonals and a 180° rotation about its center do not answer the question above.